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The magnetic induction at the centre of a current carrying circular coil of radius r is

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Important Questions on Magnetic Effects of Current

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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 84

Two long thin wires ABC and DEF are arranged as shown. The magnitude of the magnetic field at O is

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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 85

A circular conductor, of uniform resistance per unit length, is connected to a battery of 4 V. The total resistance of the conductor is 4 Ω. The net magnetic field at the centre of the conductor is

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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 86

The magnetic field B at O due to current carrying loop placed in the x-y plane as shown in the figure is

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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 87
If the current is flowing clockwise in a circular coil, the direction of magnetic lines of force inside the coil is
MEDIUM
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 88
Two concentric coils of 10 turns each are situated in the same plane. Their radii are 2 cm and 4 cm and they carry respectively 0.2 and 0.3 A current in opposite directions. The magnetic field (in Wb m-2) at the centre is
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 89
A given length of a wire carries a steady current. It is bent first to form a circular plane coil of one turn. If a loop of same length is now bent more sharply to give a double loop of smaller radius, the magnetic field at the centre caused by the same current is
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 90
Two infinitely long, thin, insulated, straight wires lie in the x-y plane along the x and y-axes respectively. Each wire carries a current i, respectively in the positive x-direction and positive y-direction. The magnetic field will be zero at all points on the straight line
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JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 91
There are two identical concentric coils of suitable radii X and Y with their planes at right angles to each other. The coil X lies in the horizontal plane while coil Y lies in the vertical plane. If the coil X carries a current of 1 A then what value of current in coil Y be passed, so that the resultant field at the centre of the coils just balances the earth's magnetic field of 10-5 T inclined at 30° with the vertical?